1975 KZ900 Advance curve information

This will help loosen up stuck piton rings:

www.amazon.com/Yamaha-Ring-Additive-32oz...-32-00/dp/B002GUCLH2 (Yamaha Ring Free)

And here's has a combustion chamber cleaner:

Mopar Combustion Chamber Cleaner # 04318001.

Thanks for the info.
Which one do you think will get rid of most of the carbon build up the quickest.
If the recommended amount is added to one tank of gas would you notice a change after it was run through? If i looked through the sparkplug hole I would see a difference.
Thanks.

Probably the Mopar cleaner would remove most of the carbon buildup vs the ring free.

Some time ago, a member of the forum(can't remember who) used the Mopar cleaner and showed the result. It did a very good job of making the combustion chamber,head and valves look almost new.

Great, Thanks, I will try to track some down.